BMW Z4 E85 steering binding
Z4
Why does the Z4 steering bind or feel notchy at highway speed?
The fault is related to the steering column and the electric power steering. One suggested cause is insufficient lubrication of the assist unit's bearings. In the USA, warranty replacements have been made for 2003-2004 model year cars.
What helps with Z4 steering binding?
First, it is worth greasing the universal joints of the steering shaft, which has eased the symptoms. If that does not help, the fault is in the power steering unit. A BMW specialist usually replaces the whole unit, which is expensive.
Can a weak battery cause Z4 steering symptoms?
Yes, a weak battery can cause symptoms in the electric power steering, and in hot weather the battery's charge can drop. Check the battery condition before more expensive repairs.